Gluing device for wrapping machines



Feb. 22, 1944. E, L SMITH ETAL 2,342,497

GLUING DEVICE FOR wRAPPING MACHINES Filed Jan. 29, 1942 2 ShSQtS-Sht 1 A9 y Ja 1 v a f 42 ATTORN EYS Feb. 22, 1944. E, SMITH E- r AL l 2,342,497

GLUING DEVICE FOR WRAPPING MACHINES Filed Jan. 29, 1942 2 Sheets-Sheet 2 INVENTORS AVL/iff? [0l/fu J/v/r//Ma BY CAHzro/r h/Zfrafz @aM/fm ATTORNE S Patented Feb. 22, 1944 2,342,497 GLUING DEVICE Foa WRAPPING MACHINES Elmer Lovell Smith, Longmeadow, and Carlton Wetsel, Springfield, Mass., assignors to Package Machinery Company, Springfield, Mass., a'corporation of Massachusetts Application January 29, 1942, Serial No. 428,664

(Cl. Sil- 47) 9 Claims.

This invention relates to gluing devices for wrapping machines and more particularly toga gluing deviceffor applying glue or other adhesive to the inner side of the nnal bottom fold.

One object of the invention is to improve and simplify gluing devices of the above character, and further and more specific objects residing in the details of its construction will be made apparent in the following specification and claims.

This application is a continuation in part of our copending application kSerial No. 393,034, 'filed May 12, 1941, issued as Patent No. 2,304,428, Dec. 8, 1942.

Referring to the drawings:

Fig. 1 is a plan view of an adhesive applying device embodying the invention;

Fig. 2 is a side elevation thereof;

Fig. 3 is a detail of the gluing device of Figs. 1 and 2 in -position to apply a spot of adhesive `to the inner surface of the last bottom flap of the wrapper;

Figs. 4, 5 and 6 are views similar to Figs. 1, 2 and 3 respectively but showing an alternative form of `the invention;

Fig. 7 is a sectional detail showing the operation of the glue transfer rolls of Figs. 1 to 6; and Figs.f8 and 9 are 'respectively a sectional detail and a fragmentary plan of a modification of the 1 glue roll drive.

Referring to Figs. 1, 2 and 3 of the drawings the device is there shown as comprising a platelike dauber l!! adapted to receive glue or other adhesive on its end and to pass through a hole yIl in the side of the vertical folding channel l2 of the Wrapping machine and into contact with last wrapper flap I3 of the otherwise completely wrapped article I4.' f'

The plate lll is carried by a bracket l5 secured to a rod i6 slidingin bearing I1 in a sub-frame I9. This sub-frame has a detachable bridgev i9 slidable toward and from `the vertical wrapping channel I2 by sliding upon irailsZll secured-'to the main frame 2l of the wrapping machine, and can be clamped in'any adjusted positionby a bolt 22. Thispermits the maximum forward position of the dauber l0' to be changed tocorrespond to different sizes of articles. Sub-frame i8 is vertically adjustable on bridge I9 by means of a clamp screw 8 and interposed shims 9.

The rod i5 which carries the dauber is provided with a member 23 clamped to it and having a lateral guide 24 engaged between spaced rails 25, thus maintaining the dauber against angular displacement.v A link 25 couples the member 23 tothe lower end of a4 bent arm. 21

secured as by a clamp screw 28 to a sleeve 29 rotating freely on a shaft 39. An arm 3| secured. to sleeve 29 is periodically rocked from a cam or other suitable means, notl shown, to reciprocate the dauber in timed relation with the wrapping mechanism with which the gluing device is associated. The end of the stroke of the dauber is regulated, as described above, byv sliding the entire gluing assembly toward or away from the wrapping channel, and to permit this the `arm 21 may be unclamped from the sleeve 29, being clamped again in position when the gluing device has been adjusted.

The dauber has a slightly narrowed end 32, best shown in Fig. 1, which rests adjacent the rear side of a glue transfer roll 33 when the dauber is in the inactive position of Fig. 2. This roll runs in closely spaced relation to a supply roll 34 journaled on a glue box 35 and dipping into it to receive glue and carry it tothe transfer roll as the supply roll is rotated intermittentlyr by mechanism to be described. The glue box is held in position on the sub-frame by a clamp screw 36 so that it may be removed for cleaning. The transfer roll 33 is not mounted directly on the glue box, but upon rockers' 31 pivoted coaxially with the supply roll. Springs 38'l give to these rockers a tendency to rotate counterclockwise as viewed in Fig. 2. As the dauber moves forwardly it pushes on rolls 40 at the ends of the transfer roll and forces the arms to tilt against the springs. As the roll rocks, the dauber passes over its surface, lateral abutments 39 on the dauber maintaining engagement with rolls 40. Ultimately the ksides of the dauber ride'over these rolls 40, which are of slightly larger diameter than the transfer roll, and hold the bottom face of the dauber out of contact with the adhesive coated surface of the latter. When the dauber is extended into the position'of Fig. 3 it deposits a stripe of glue on the inner surface 'of the nap i3, which is the last unfolded flap `extending down the wrapping channel; and when the dauber again retracts the transfer roll springs up in frontof it to apply afresh supply of 'glue to the end of the dauber. The rolls it serve not only to prevent smearing of the under side of the dauber but to keep the roll 33 suii'iciently away from the end of the dauber when in the position of Fig. 2 so that the glue nlm will be transferred and not squeezed out.

The supply roll is periodically rotated 'to convey adhesive to the transfer roll by a ratchet 4| located on one end of the supply roll andengaged by apawl 42 carried by a rocker 43 andprovided with a leaf spring All. 'Ihe rocker is coupled by a link `i with an arm 46 pivoted at 41 and also bearing a roll 48 held in engagement with a cam plate 4S on the bracket I5 by means of a spring 56. As the dauber moves back and forth the cam roll 48 will be raised and lowered to cause intermittent rotation of the supply roll (cf. Figs. 2 and 3). The supply and transfer rolls are preferably connected by gearing 5I (Fig. l), and in the form shown should be somewhat separated as in Fig. 7 to prevent squeezing out the glue film without transferring it to the upper roll.

In Figs. 4, 5, and 6 is shown an alternative, and in some ways preferable, form of the device. Referring to these figures the dauber plate It! is carried by a -bracket titl. The rod it to which bracket 68 is secured, its support on sub-frame I8, the means for reciprocating plate lil, and the adjusting parts are identical with those previously disclosed and need not be again described. For greater rigidity of the device bracket has a rearwardly extending portion 5S bolted at iii to the lateral guide Plate Hi is fastened to bracket 5E by a bar 62 and is secured to the plate and bracket by screws 53, the plate being provided with dowels 54 to prevent its lateral displacement. The glue transfer roll 33 is carried by a yoke t5, formed with bearings 65 'for the transfer roll and provided on its ends with hubs 6'1 by which the yoke is pivotally mounted on shaft 58 of the supply roll 34 journaied o-n a glue box BQ supported in turn by sub-frame i3. Gne hub 5l' is provided with an arm it carrying a driving pawl l! engaging a ratchet 'l2 iiXed to the shaft of the supply roll. A holding pawl 'I3 pivoted to a bracket '14 on the glue boX, also engages ratchet 72. Pawls 'il and l are each provided with a leaf spring 'f5 to hold them in engagement with the ratchet. The free end of arm 'lil is pivotally connected to one end of a link 16, the other end of which is pivoted at Tl to one arm I3 of a rocker la, pivoted at 8i) to glue box i59. The other arm 3| of rocker 'i9 carries a cam roll 82 positioned to engage a cam member 83 secured to bracket 60. A spring 84 connected between pivot 'Il and a pin 85 tends to rotate rocker 'IS in a counterclockwise direction as viewed in Figs. 5 and 5, and holds transfer roll 33 against the end edge 32 of the dauber Iii. As in the first embodiment described, the supply and transfer rolls are connected by gearing 5I.

In Figs. 1.1. and 5 the parts are shown with the dauber in retracted position. As the dauber is advanced transfer roll 33 is pushed downwardly by the dauber and immediately thereafter cam 83 engages roll 82 to depress the transfer roll well below the dauber as shown in Fig. 6. Upon retraction of the dauber spring 84 swings the transfer roll around the end of the dauber and into contact therewith. At the same time pawl imp-arts a partial rotation to the supply roll 54. The form of the device shown in Figs. 4, 5, and 6 has the advantage of fewer parts and avoids the friction and upward thrust on the underside of the dauber plate exerted by the rolls used in the form. rst described.

As stated above, it is desirable to maintain the rolls 33 and 3l! a short distance out of contact, even though this distance may be only a few thousandths of an inch, in order to permit passage of the glue film between the rolls. So that the necessity of preserving this spacing may be avoided, the construction shown in Figs. 8 and 9 may be used. Here the supply roll 34 and the transfer roll 33' are provided with pinions 80 and 92 laterally separated and connected through a wide idler Si. The two rolls are thus driven in opposite directions, and as Will be seen from Fig. 8 the transfer roll can always pick up the oncoming lm on roll 34. A further advantage of this type of structure is that it gives better control of film thickness. As shown in Fig. 7, the nlm is governed by a doctor blade 93 adjacent the lower roll, but if the rolls are set too close together for this film to pass between them it will accumulate between the bite of the rolls and the doctor. In the form shown in Figs. 8 and 9 the upper roll can always pick up the film presented to it, so this trouble does not arise.

What we claim is:

1. A gluing device for wrapping machines which comprises a dauber movable to and from engagement with a wrapper flap, a glue supply roll positioned to one side of the path of movement of the dauber, a transfer roll mounted to swing about the supply 'roll adjacent therewith and into and out of he path of movement of the dauber and spring pressed for movement adjacent the end of dauber when the latter is in. lretracted position, and means to hold the transfer roll and dauber out of glue transferring adjacency except at the end of the dauber.

2. A gluing device for wrapping machines which comprses a dauber movable to and from engagement with a wrapper flap, a glue supply roll positioned to one side of the path of movement of the dauber, a transfer roll mounted to swing about the supply roll adjacent therewith 'and into and out of the path of movement of the dauber and spring pressed into adjacency with the end of the dauber when the latter is in retracted position, means actuated by the movement of the dauber to rotate the supply roll, and means to hold the transfer roll and dauber out of contact except at the end of the dauber.

3. A gluing device for wrapping machines which comprises a dauber movable to and from engagement with a wrapper flap, a glue supply roll positioned to one side of the path of movement of the dauber, a transfer roll mounted to swing about the supply roll adjacent therewith and into and out of the path of movement of the dauber and spring pressed into adjacency with the end of the dauber when the latter is in retracted position, means actuated by the movement of the dauber to rotate the supply roll, and cooperating surfaces carried by the transfer roll and dauber to hold the transfer roll and dauber out of contact except at the end of the dauber.

4. A gluing device for wrapping machines which comprises a dauber movable to and from engagement with a wrapper flap, a glue supply roll positioned to one side of the path of movement of the dauber, a transfer roll mounted to swing about the supply roll adjacent therewith and into and out cf the path. of movement of the dauber and spring pressed into adjacency with the end of the dauber when the latter is in retracted position, means actuated by the movement of the dauber to rotate the supply roll with its surface traveling opposite to the surface of the suply roll, and cooperating surfaces carried by the transfer roll and dauber to hold the transfer roll and dauber out of contact except at the end of the dauber.

5. A gluing device for wrapping machines which comprises a dauber movable to and from engagement with a' wrapper flap, a glue supply roll positioned to one side of the path of movement of dauber, a transfer roll mounted to swing about the supply roll in adjacency therewith and into and out of the path of movement of the dauber and spring pressed into adjacency with the end of the dauber when the latter is in retracted position, a one-way drive for the supply roll, a cam carried by the dauber for actuating said drive, and cooperating surfaces carried by the transfer roll and dauber for holding the transfer roll and dauber out of glue-transferring adjacency except at the end of the dauber.

6. A gluing device for wrapping machines which comprises a dauber movable to and from engagement with a wrapper flap, a glue supply roll positioned to one side of the path of movement `of the dauber, a transfer roll mounted to swing about the supply roll in adjacency therewith and spring pressed into adjacency with the end of the dauber when the latter is in retracted position, a one-way drive for the supply roll, a cam carried by the dauber for actuating said drive, and cooperating surfaces carried by the transfer roll and dauber for holding the transfer roll and dauber out of glue-transferring adjacency except at the end of the dauber and for holding the transfer roll spaced from the dauber a, distance less than the thickness of the plue film when the transfer roll is at the end of the dauber.

7. A gluing device for Wrapping machines which comprises a dauber movable to and from engagement with a wrapper flap, a glue supply roll positioned to one side of the path of movement of the dauber, rocker arms pivotally mounted on the axis of the supply roll, a transfer roll journaled in said -arms to swing about the supply roll in adjacency therewith, a spring acting on said arms to press the roll into adjacency with the end of the dauber when the latter is in retracted position, a one-way driving connection between the rocker arms and the supply roll and a cam carried by the dauber for rocking said arms against the action of the spring to position the transfer roll out of glue-transferring adjacency with the dauber as the latter is advanced to flap contacting position.

8. A gluing device for wrapping machines which comprises a dauber movable to and from adjacency with a wrapper flap, a transfer roll, a supply roll, means for moving the transfer roll into glue-transferring relation to the end of the dauber when the latter is retracted from the wrapper flap and into glue-receiving relation to the supply roll when the dauber is advanced, and means fo-r guiding the transfer roll relative to the dauber to space it from the end thereof a distance less than the thickness of the glue lm.

9. A gluing -device for wrapping machines which comprises a plate-like dauber movable to and from adjacency with a Wrapper flap, said dauber having shouldered forward corners, a transfer roll having a central glue-transferring section and end sections contacting said shoulders and of a diameter causing the central portion of the roll to be spaced from the end of the dauber a distance less than the thickness of the glue film, means for moving the roll into and out of gluetransferring adjacency to the end of the dauber, and means for supplying the transfer roll with a glue film.

ELMER. LOVELL SMITH. CARLTON WETSEL, 

